A Level Gravitational Fields Revision Site

Animations, diagrams and figures to help you ace your exams!

This animation demonstrates Kepler's Second Law: an orbiting planet sweeps out equal areas in equal times during its orbit. The elliptical orbit below is split into 9 equal area segments, and the planet goes along each segment's arc in the same amount of time.

This animation shows how two gravitional potentials interact: Jupiter's mass is large enough for this effect on the Sun to be visible as shown.

This animation shows how the combined gravitational potential is altered when varying the mass of one of the planets in the system.

This figure shows a 3D potential well of the Sun, with potential on z axis and xy coordinates in space.

This figure shows how planets in an elliptical orbit move faster when closer to the Sun as the field lines get closer together

This animation shows a multiplanetary system with two planets orbiting a star